vkr: random refactoring and fixes
Refactor the messy vkr_dispatch_vkAllocateMemory and avoid a segfault if some venus driver impl makes calls to physical device/group enumerations out of order (this is to be fixed to relax the order requirement).
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Refactor the messy vkr_dispatch_vkAllocateMemory and avoid a segfault if some venus driver impl makes calls to physical device/group enumerations out of order (this is to be fixed to relax the order requirement).